Brake mechanism



Aug. 14, 1928.

R. 5. SAN FORD BRAKE MECHANISM File 1d Nov, 10, 1927 III'h/IIg/IIIIIIII INVENTOR ROY S. SANFORD ATTORNEYS Patented Aug. 14; f I

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Paiarrr,v OFFICE;

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BRAKE Mnona'msm;

7 I Application filed November 10, L927. Serial No. 282,253.

My "invention relates to improvements in brake mechanism and particularly. to an 1mproved bearing member 'mounted upon a brake shoe and carrying thrust rollersto be engaged by the operating cam. 7 An object is to provide a form of bearing member lendin 'r1 idity to the .shoe and the rollers,fand pre eraily in the form of a bushs'hoe. The rol are -m be -mounted on a pivot 'jour naled in the bushing, but preferably they are mounted onthe bushing itself andheld axiall by a bolt or the through the bu ing.- 1

like passing Other objectsand advantages of my invention will more fully appear from the following descr'i tion, appended claims and ac- 'oompanymg rawing, wherein:

Figure 1 is a ,fragmenta elevation of a brake drum provided with rake shoes ca'rrying'irollers and embodying my invention. Figure'-2,is-a sectional view taken on line 22 of Figure 1.

' Figure 3 is a sectional view taken on the "53111811119 as Figure 2 through a modified drum having a backing form of construction v In the drawing let 10 indicate a brake plate 12 and wherein 15 mounted a pair of rake shoes 14 and 16 held in constraint-away from the drum by a 'spring 18. T 20 indicates the operatin cam supported upon'a camshaft 22 Bee shoe is providedwith a pair of bearing rollers 24 (Figure 2) or'124 (Figure 3) adapted to take the thrust of the cam. These rollers 24 or lu tre here shown as formed or hollow. sheet, metal stampin gs. In the arrangement of Figure 2, the rollers are mounted on=pivots28 carried by bushings 29. One end of each pivot 28 may be riveted "over on its roller 24, the other roller being held by a nut 30.; The bushings 29 are permanently seoured to the shoe, each being shown'with a shoulder enga 'ng one face of the shoe web 26, and with a ange 32 riveted shoeweb 26.

"held by a nut 40 threaded on,

the end of bushing 36, the bushing thus preing permanentl secured in the web of the the arrangement of Figure 3 the rollers 124 are formed with central tubular bearing flanges 34, and the rollers are directly mounted; on bushings 36 cured in the shoe webs 26. A pin 38 assing through each bushing 36 has a head olding one o the rollers 124, the other roller being the pin against ventinganybinding of the rollers when the nut is tightened.

of an intermediate portion ofgreater diameter and the other roller of the pair en-.

gages the other side. of the cam uponthe other side of suchintermediate portion of greatest diameter and that the cam itself serves to assist in spacing the rollers a art, and also acts throu h the rollers to hold the shoes against latera movement. WVhatI claim is:

1. A brake shoe having a stiifenin web provided with a bushing permanenty secured in its web, in combination with rollers adjacent each end of the bushing, and a member passing through the bushing and co-operating w th the bushing in holding the rollers.

2. Abrake shoe having a stiffening .web, a bushing permanently secured in sand web and projecting at'opposite sides of said web, rollers mounted on opposite ends of said bushing, and a device passing through the bushin and preventing axial movement of the rol ers..

3. A brake shoe having a permanently mounted bushing projecting at its opposite sides, rollers mounted on opposite'ends of permanently sesaid bushin a pin passing through the bushing an having a head engaging one end of the bushing and holding one of the rollers, and a nut threaded on the opposite end of the mend .e agin the opposite end of the ushing an hol ing the other roller. In testimony whereof, I, Ror S. SANFORD, sign this specification.

ROY S. SANFORD. 

